A special workflow node for Nuke that shows the current version of the connected input in its label.

version_info.tcl

set cut_paste_input [stack 0]
version 10.5 v3
push $cut_paste_input
NoOp {
 name Version1
 knobChanged "if nuke.thisKnob().name() == 'inputChange':\n  label = nuke.thisNode().knob('label')\n  label.setValue(label.getValue())"
 label "\[if \{\[exists \[topnode].file]\} \{return \[string range \[regexp -inline \"_v\\\[0-9]*\" \[value \[topnode].file]] 1 end]\} \{\}]"
 note_font_size 50
 selected true
 xpos -810
 ypos -5216
}